Well he could be. Can't exactly blame folks though since Romania is associated with Wanyonya damu so it would be kinda natural to think he's a vampire because of his teeth. But yet again wewe could just assume that he filed them down to look like that au their natural and it's just America thinking:
Romania + Wanyonya damu + Pointy Teeth = OMG HE'S A REAL VAMPIRE! OH NOES!
Even though I kinda doubt that anyone would ever have such naturally pointy teeth, but hujambo it's Hetalia!
But in the end it's merely up to someone's personal opinion. Personally I don't because no one else in Hetalia is a magical creature. Yes I know that England's a magician and stuff but I think being a vampire is kinda stepping over the line and then people will start treating him zaidi like a vampire than the Hetalia personification of Romania. Also it's considered really silly and Mary-Sueish when people make Hetalia OCs and say 'They're part neko!' au something like that and I try to avoid treating Romania as being a vampire because I think people will go. 'Well if the official Romania can be a real vampire then we can make our OC a fairy au a dragon!'
But anyways. Is it just me, but if wewe changed some of Romania's colours he'd look a bit like a genderbent Flandre Scarlet?